Controlling mesh modifiers with animation nodes
It can be done using the "Object Data Path Output" node:

Add the node to the node tree.

Select the object whose properties are to be modified in the first input of the Object Data Path Output node.

Copy the data path from the parameter you want to animate by right-clicking and selecting "Copy data path."

Paste the data path into the Path input of the Object Data Path Output node.

Set the value of the property using the Value input of the Object Data Path Output node.